Derivative Instruments and Hedging Activities - Derivative Instruments Not Designated as Hedging Instruments (Detail) - Derivatives Not Designated as Hedges [Member] - Other income (expense), net [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Foreign Exchange Forward Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Gains/(losses) from derivative instruments not designated as hedging instruments	$ 7.8	$ (10.0)	$ 8.0	$ (25.2)
Forward Exchange Agreement [Member]
Derivative Instruments Gain Loss [Line Items]
Gains/(losses) from derivative instruments not designated as hedging instruments		$ 3.0		$ 3.0